Barack Obama, US president, offered more support for protesters against the global financial system after a weekend of demonstrations in cities around the world, but called on them not to ‚Äúdemonise‚ÄĚ those who worked on Wall Street.

On Sunday, Mr Obama honoured Martin Luther King at a dedication to a new memorial on National Mall in Washington. Referring to protests that have spread from Wall Street to London, Rome and elsewhere, Mr Obama said: ‚ÄúDr King would want us to challenge the excesses of Wall Street without demonising those who work there.‚ÄĚ Mr Obama had previously said the protests ‚Äúexpress the frustration‚ÄĚ of ordinary Americans with the financial sector....